From 11e6d596b80421d5eba5614f33d963e934c87f7e Mon Sep 17 00:00:00 2001
From: Fabio Erculiani <lxnay@sabayon.org>
Date: Thu, 26 Dec 2013 16:08:16 +0100
Subject: [PATCH] [entropy.db.sqlite] do not clear the cache if locks are
 already acquired

---
 lib/entropy/db/sqlite.py | 32 ++++++++++++++++++++------------
 1 file changed, 20 insertions(+), 12 deletions(-)

diff --git a/lib/entropy/db/sqlite.py b/lib/entropy/db/sqlite.py
index 53ad2dca9..5c006f0ce 100644
--- a/lib/entropy/db/sqlite.py
+++ b/lib/entropy/db/sqlite.py
@@ -563,11 +563,13 @@ class EntropySQLiteRepository(EntropySQLRepository):
         if lock.directed():
             return lock
 
+        already_acquired = lock.is_already_acquired()
         lock.acquire_shared()
 
-        # in-RAM cached data may have become stale
-        if not self._is_memory():
-            self.clearCache()
+        if not already_acquired:
+            # in-RAM cached data may have become stale
+            if not self._is_memory():
+                self.clearCache()
 
         return lock
 
@@ -579,11 +581,13 @@ class EntropySQLiteRepository(EntropySQLRepository):
         if lock.directed():
             return lock
 
+        already_acquired = lock.is_already_acquired()
         acquired = lock.try_acquire_shared()
         if acquired:
-            # in-RAM cached data may have become stale
-            if not self._is_memory():
-                self.clearCache()
+            if not already_acquired:
+                # in-RAM cached data may have become stale
+                if not self._is_memory():
+                    self.clearCache()
             return lock
         else:
             return None
@@ -596,11 +600,13 @@ class EntropySQLiteRepository(EntropySQLRepository):
         if lock.directed():
             return lock
 
+        already_acquired = lock.is_already_acquired()
         lock.acquire_exclusive()
 
-        # in-RAM cached data may have become stale
-        if not self._is_memory():
-            self.clearCache()
+        if not already_acquired:
+            # in-RAM cached data may have become stale
+            if not self._is_memory():
+                self.clearCache()
         return lock
 
     def try_acquire_exclusive(self):
@@ -611,11 +617,13 @@ class EntropySQLiteRepository(EntropySQLRepository):
         if lock.directed():
             return lock
 
+        already_acquired = lock.is_already_acquired()
         acquired = lock.try_acquire_exclusive()
         if acquired:
-            # in-RAM cached data may have become stale
-            if not self._is_memory():
-                self.clearCache()
+            if not already_acquired:
+                # in-RAM cached data may have become stale
+                if not self._is_memory():
+                    self.clearCache()
             return lock
 
     def _release_reslock(self, lock, mode):